在android源碼目錄external/wap_supplicant，該模塊編譯提供wifi撥號連接wpa驗證工具，因此如果沒用使用到wifi，可以不需要編譯wpa工具
編譯wpa工具配置源碼：
ifeq ($(WPA_BUILD_SUPPLICANT),true)
########################
include $(CLEAR_VARS)
LOCAL_MODULE := wpa_cli
LOCAL_MODULE_TAGS := debug
LOCAL_SHARED_LIBRARIES := libc libcutils
LOCAL_CFLAGS := $(L_CFLAGS)
LOCAL_SRC_FILES := $(OBJS_c)
LOCAL_C_INCLUDES := $(INCLUDES)
include $(BUILD_EXECUTABLE)
########################
include $(CLEAR_VARS)
LOCAL_MODULE := wpa_supplicant
ifdef CONFIG_DRIVER_CUSTOM
LOCAL_STATIC_LIBRARIES := libCustomWifi
endif
ifneq ($(BOARD_WPA_SUPPLICANT_PRIVATE_LIB),)
LOCAL_STATIC_LIBRARIES += $(BOARD_WPA_SUPPLICANT_PRIVATE_LIB)
endif
LOCAL_SHARED_LIBRARIES := libc libcutils libcrypto libssl
LOCAL_CFLAGS := $(L_CFLAGS)
LOCAL_SRC_FILES := $(OBJS)
LOCAL_C_INCLUDES := $(INCLUDES)
include $(BUILD_EXECUTABLE)
########################
#
#include $(CLEAR_VARS)
#LOCAL_MODULE := eapol_test
#ifdef CONFIG_DRIVER_CUSTOM
#LOCAL_STATIC_LIBRARIES := libCustomWifi
#endif
#LOCAL_SHARED_LIBRARIES := libc libcrypto libssl
#LOCAL_CFLAGS := $(L_CFLAGS)
#LOCAL_SRC_FILES := $(OBJS_t)
#LOCAL_C_INCLUDES := $(INCLUDES)
#include $(BUILD_EXECUTABLE)
#
########################
#
#local_target_dir := $(TARGET_OUT)/etc/wifi
#
#include $(CLEAR_VARS)
#LOCAL_MODULE := wpa_supplicant.conf
#LOCAL_MODULE_TAGS := user
#LOCAL_MODULE_CLASS := ETC
#LOCAL_MODULE_PATH := $(local_target_dir)
#LOCAL_SRC_FILES := $(LOCAL_MODULE)
#include $(BUILD_PREBUILT)
#
########################
endif # ifeq ($(WPA_BUILD_SUPPLICANT),true)
可以看到wap編譯可以通過定義WPA_BUILD_SUPPLICANT進行配置
WPA_BUILD_SUPPLICANT定義：
WPA_BUILD_SUPPLICANT := false
ifneq ($(TARGET_SIMULATOR),true)
ifneq ($(BOARD_WPA_SUPPLICANT_DRIVER),)
WPA_BUILD_SUPPLICANT := true
CONFIG_DRIVER_$(BOARD_WPA_SUPPLICANT_DRIVER) = y
endif
endif
BOARD_WPA_SUPPLICANT_DRIVER的定義在BoardConfig.mk文件中。
根據上面配置信息，若不想編譯wpa工具，可以使用不定義BOARD_WPA_SUPPLICANT_DRIVER，或者定義爲空即可。